1. I run 28" wide Groovy Luv Handles. Bar width is much more of a personal preference than a singlespeed specific thing. Generally speaking, it's true that the wider the bar, the more leverage you are going to have when working the bike up the hills. However, the width should be spec'd to you're physical size. I'm 6'4" with gorilla arms and I only feel comfortable on bars that are 28-30 inches wide, regardless of whether I am riding SS or geared.
2. A rigid fork would be fine for your smooth tarmac conditions. A suspension fork wouldn't be necessary for that type of riding. A quality steel fork would work great, as would carbon, but that might be overkill. FWIW, I run a rigid carbon fork (On One) on my 29er SS and ride it on everything except gnarly, chunky downhill. It's great on smooth to moderate singletrack.
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